function openWindow(url, name, w, h) {
    if (document.all)
        var xMax = screen.width, yMax = screen.height;
    else
        if (document.layers)
            var xMax = window.outerWidth, yMax = window.outerHeight;
        else
            var xMax = 640, yMax=480;

    var xOffset = (xMax - 200)/2, yOffset = (yMax - 200)/2;

	popupWin = window.open(url, name, 'menubar=1,toolbar=1,scrollbars=1,resizable=1,location=0,status=1,width=' + w + ',height=' + h + ',screenX='+xOffset+',screenY='+yOffset+', top='+yOffset+',left='+xOffset+'').focus();
	
}